Sage 9 with PHP 8.1

Hi,

I was trying to update the dependencies and was following this.

I am working on the localhost Xamp on windows and used this composer.json file.

{
  "name": "roots/sage",
  "type": "wordpress-theme",
  "license": "MIT",
  "description": "WordPress starter theme with a modern development workflow",
  "homepage": "https://roots.io/sage/",
  "authors": [
    {
      "name": "Ben Word",
      "email": "ben@benword.com",
      "homepage": "https://github.com/retlehs"
    },
    {
      "name": "Scott Walkinshaw",
      "email": "scott.walkinshaw@gmail.com",
      "homepage": "https://github.com/swalkinshaw"
    },
    {
      "name": "QWp6t",
      "email": "hi@qwp6t.me",
      "homepage": "https://github.com/qwp6t"
    }
  ],
  "keywords": ["wordpress"],
  "support": {
    "issues": "https://github.com/roots/sage/issues",
    "forum": "https://discourse.roots.io/"
  },
  "autoload": {
    "psr-4": {
      "App\\": "app/"
    }
  },
  "repositories": [
    { "type": "vcs", "url": "https://github.com/jeh5256/sage-installer"},
    { "type":"vcs", "url":"https://github.com/jeh5256/sage-lib" }
  ],
  "require": {
    "php": ">=7.1",
    "composer/installers": "~2.0",
    "illuminate/support": "^8.0",
    "roots/sage-lib": "dev-master",
    "soberwp/controller": "~2.1.0"
  },
  "require-dev": {
    "squizlabs/php_codesniffer": "^2.8.0",
    "roots/sage-installer": "dev-master"
  },
  "scripts": {
    "test": ["phpcs"],
    "post-create-project-cmd": [
      "Roots\\Sage\\Installer\\ComposerScript::postCreateProject"
    ]
  }
}

After running Update Composer, I am getting this error.

Fatal error: Uncaught ReflectionException: Class "App\Controllers\App" does not exist in C:\xampp\htdocs\php\wp-content\themes\zaks-sage\vendor\soberwp\controller\src\Loader.php:75 Stack trace: #0 C:\xampp\htdocs\php\wp-content\themes\zaks-sage\vendor\soberwp\controller\src\Loader.php(75): ReflectionClass->__construct('App\\Controllers...') #1 C:\xampp\htdocs\php\wp-content\themes\zaks-sage\vendor\soberwp\controller\src\Loader.php(35): Sober\Controller\Loader->setPath() #2 C:\xampp\htdocs\php\wp-content\themes\zaks-sage\vendor\soberwp\controller\controller.php(41): Sober\Controller\Loader->__construct(Object(Brain\Hierarchy\Hierarchy)) #3 C:\xampp\htdocs\php\wp-includes\class-wp-hook.php(308): Sober\Controller\loader('') #4 C:\xampp\htdocs\php\wp-includes\class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array) #5 C:\xampp\htdocs\php\wp-includes\plugin.php(517): WP_Hook->do_action(Array) #6 C:\xampp\htdocs\php\wp-settings.php(617): do_action('init') #7 C:\xampp\htdocs\php\wp-config.php(97): require_once('C:\\xampp\\htdocs...') #8 C:\xampp\htdocs\php\wp-load.php(50): require_once('C:\\xampp\\htdocs...') #9 C:\xampp\htdocs\php\wp-admin\admin.php(34): require_once('C:\\xampp\\htdocs...') #10 C:\xampp\htdocs\php\wp-admin\themes.php(10): require_once('C:\\xampp\\htdocs...') #11 {main} thrown in C:\xampp\htdocs\php\wp-content\themes\zaks-sage\vendor\soberwp\controller\src\Loader.php on line 75

Can anyone please help me?

The reason is the case sensitivity of the directories names, see this issue and the fix:

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